Characterization and Optimization of Thermally Grown Iridium Oxide and Its Application to pH Sensors

doi:10.18494/sam.2018.1733

Cited by 2 publications

(1 citation statement)

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“…After a comprehensive assessment carried out by comparing the sensitivity, Nernstian response range, and potential drift of metal/metal oxide electrodes, including Sb-Pb oxide, PtO 2 , IrO 2 , RuO 2 , Ta 2 O 5 , and WO 3 , iridium oxide (IrO x ) electrodes were found to be the most promising for pH detection. (14)(15)(16) The performance of IrO x electrodes is determined by the fabrication method used; methods include electrodeposition, (17)(18)(19) cyclic voltammetry (CV), (20)(21)(22) radio frequency (RF) magnetron sputtering deposition, (23)(24)(25)(26)(27) high-temperature carbonate oxidation, (2,(28)(29)(30)(31) and thermal oxidation. (14,(32)(33)(34)(35) The properties and structures of IrO x electrodes fabricated by different methods differ, among which IrO x electrodes fabricated by electrodeposition and CV exhibit a super-Nernstian response with an E (electrode potential)-pH sensitivity higher than −60 mV/pH.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Factors of Thermal Oxidation Influencing Properties of Iridium Oxide Electrodes

Huang¹,

Bi²,

Wan³

et al. 2020

Sensors and Materials

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Using thermal oxidation for fabricating iridium oxide (IrO x) electrodes is a good choice for obtaining robust pH electrodes. We fabricated IrO x electrodes at different temperatures for different heating times to obtain electrodes with different E (electrode potential)-pH responses, response rates, and long-term stability. Corresponding characterizations, which include surface morphology, section morphology and composition, surface composition, and surface roughness, are examined intensively. Scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS) are used to carry out the characterizations. All prepared electrodes had a near-Nernstian response, especially when heated at 750, 800, and 870 ℃ for 1.0 and 1.5 h. IrO x electrodes fabricated with these heat treatment parameters had a relatively high response speed, a small potential drift, few cracks on the surface oxide film, thick films, and a small reaction impedance. The surface roughness and composition of the IrO x electrodes fabricated at different temperatures for 1.5 h were also obtained to clarify the relationship between the electrode composition, structure, and properties. Finally, the properties of the electrodes and their relationship with technical preparation parameters and the electrode structure and composition are discussed.

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Section: Introductionmentioning

confidence: 99%

Insight into the Factors of Thermal Oxidation Influencing Properties of Iridium Oxide Electrodes

Huang¹,

Bi²,

Wan³

et al. 2020

Sensors and Materials

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In Situ pH Monitoring in Turbid Coastal Waters Based on Self-Electrodeposition Ir/IrO₂ Electrode

Zhou

Pan

Wang

et al. 2021

J. Electrochem. Soc.

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Direct and accurate monitoring of pH in turbid waters is a challenging task for environmental monitoring and analysis. In this study, iridium oxide (IrO2) with selective sensing ability toward H+ was produced on the surface of iridium (Ir) electrode by rapid self-electrodeposition. IrO2 was deposited on electrode surface by atomic force, which could decrease the adverse effect of the suspended particles in turbid water. Properties of the Ir/IrO2 electrode were investigated by X-ray photoelectron spectroscopy, scanning electron microscopy, and electrochemical technology. The sensitivity and response time of the Ir/IrO2 electrode for pH determination were assessed, and a rapid and linear pH response of approximately 65 ± 3.5 mV pH−1 was observed across a wide pH range between 1.8 and 11.9. Moreover, the electrode exhibited a good temperature linearity (20 °C–60 °C), low potential drift (0.75 mV h−1), high accuracy (±0.05), and a long life span (up to 30 d). The practical investigation revealed faster equilibrium rate and higher stability of the Ir/IrO2 electrode than that of traditional glass pH electrode. Furthermore, the Ir/IrO2 electrode was successfully used for in situ pH monitoring in 750 formazin turbidity units (FTU) for turbid coastal river water. Therefore, the developed Ir/IrO2 pH electrode offers large applicability for in situ pH monitoring in turbid environmental water matrices.

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Characterization and Optimization of Thermally Grown Iridium Oxide and Its Application to pH Sensors

Cited by 2 publications

References 20 publications

Insight into the Factors of Thermal Oxidation Influencing Properties of Iridium Oxide Electrodes

Insight into the Factors of Thermal Oxidation Influencing Properties of Iridium Oxide Electrodes

In Situ pH Monitoring in Turbid Coastal Waters Based on Self-Electrodeposition Ir/IrO₂ Electrode

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Characterization and Optimization of Thermally Grown Iridium Oxide and Its Application to pH Sensors

Cited by 2 publications

References 20 publications

Insight into the Factors of Thermal Oxidation Influencing Properties of Iridium Oxide Electrodes

Insight into the Factors of Thermal Oxidation Influencing Properties of Iridium Oxide Electrodes

In Situ pH Monitoring in Turbid Coastal Waters Based on Self-Electrodeposition Ir/IrO2 Electrode

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In Situ pH Monitoring in Turbid Coastal Waters Based on Self-Electrodeposition Ir/IrO₂ Electrode